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Analysis of ventilation efficiency as simultaneous control of radon and carbon dioxide levels in indoor air applying transient modelling
ID Dovjak, Mateja (Avtor), ID Vene, Ožbej (Avtor), ID Vaupotič, Janja (Avtor)

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Izvleček
The impact of ventilation efficiency on radon ($^{222}$Rn) and carbon dioxide (CO$_2$) concentrations in the indoor air of a residential building was studied by applying transient data analysis within the CONTAM 3.4 program. Continuous measurements of $^{222}$Rn and CO$_2$ concentrations, together with basic meteorological parameters, were carried out in an apartment (floor area about 27 m$^2$) located in Ljubljana, Slovenia. Throughout the experiment (October 3–15), frequent ventilation (several times per day), poor ventilation (once to twice per day) and no ventilation scenarios were applied, and the exact ventilation and occupancy schedule were recorded. Based on the measurements, a transient simulation of $^{222}$Rn and CO$_2$ concentrations was performed for six sets of scenarios, where the design ventilation rate (DVR) varied based on the ventilation requirements and recommendations. On the days of frequent ventilation, a moderate correlation between the measured and simulated concentrations (r = 0.62 for $^{222}$Rn, r = 0.55 for CO$_2$) was found. The results of the simulation indicated the following optimal DVRs: (i) 36.6 m$^3$ h$^{−1}$ (0.5 air changes per hour, ACH) to ensure a CO$_2$ concentration below 1000 ppm and a $^{222}$Rn concentration below 100 Bq m$^{−3}$; and (ii) 46.9 m$^3$ h$^{−1}$ (0.7 ACH) to ensure a CO$_2$ concentration below 800 ppm. These levels are the most compatible with the 5C_Cat I (category I of indoor environmental quality, defined by EN 16798-1:2019) scenario, which resulted in concentrations of 656 ± 121 ppm for CO$_2$ and 57 ± 13 Bq m$^{−3}$ for $^{222}$Rn. The approach presented is applicable to various types of residential buildings with high overcrowding rates, where a sufficient amount of air volume to achieve category I indoor environmental quality has to be provided. Lower CO$_2$ and $^{222}$Rn concentrations indoors minimise health risk, which is especially important for protecting sensitive and fragile occupants.

Jezik:Angleški jezik
Ključne besede:ventilation, residential buildings, transient modelling, radon, carbon dioxide
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FGG - Fakulteta za gradbeništvo in geodezijo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2022
Št. strani:20 str.
Številčenje:Vol. 19, iss. 4, art. 2125
PID:20.500.12556/RUL-135018 Povezava se odpre v novem oknu
UDK:502/504:697.97
ISSN pri članku:1660-4601
DOI:10.3390/ijerph19042125 Povezava se odpre v novem oknu
COBISS.SI-ID:97826563 Povezava se odpre v novem oknu
Datum objave v RUL:17.02.2022
Število ogledov:870
Število prenosov:200
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Gradivo je del revije

Naslov:International journal of environmental research and public health
Skrajšan naslov:Int. j. environ. res. public health
Založnik:MDPI
ISSN:1660-4601
COBISS.SI-ID:1818965 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:14.02.2022

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:prezračevanje, stanovanjske stavbe, nestacionarno modeliranje, radon, ogljikov dioksid

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0158
Naslov:Gradbene konstrukcije in gradbena fizika

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P1-0143
Naslov:Kroženje snovi v okolju, snovna bilanca in modeliranje okoljskih procesov ter ocena tveganja

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:J1-1716
Naslov:STRAP - Izvor, transport in ponor obstojnih zračnih onesneževal v okolju Slovenije

Financer:Drugi - Drug financer ali več financerjev
Program financ.:Republic of Slovenia, Ministry of Education, Science and Sport
Številka projekta:C3330-19-952056
Naslov:Development of research infrastructure for the international competitiveness of the Slovenian RRI space
Akronim:RI-SI-EPOS

Financer:EC - European Commission
Program financ.:European Regional Development Fund
Naslov:Development of research infrastructure for the international competitiveness of the Slovenian RRI space
Akronim:RI-SI-EPOS

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